| 摘要 |
PURPOSE:To supply the natural sound without a sense of incompatibility, to remove the impulse noise between discretes by sampling the sound signal and to obtain excellent noise removing processing effects by removing the pulse noise section by using a sampling frequency conversion. CONSTITUTION:A sound signal outputted by a distinguishing device 18 enters through a low-pass filter 34 of the invented circuit 30 to a sampled and hold circuit 36, and sampled at a frequency f1. Respective samples are converted to the digital value at an A/D converter 38, and by a noise detecting output from an impulse noise detecting device 32, the sample for the noise is removed. At a signal processor 40, respective samples which the A/D converter 38 outputs are sampled at a frequency fp again, low-pass filtering is executed for the resampled sample, and the result is resampled at a frequency f2 (here, fp=Mf1= Nf2, and M and N are integers and M, N is obtained). The output of the signal processor 40 is converted to an analog by a D/A converter 50, and through a low-pass filter 52, the analog sound signal, from which the noise is removed, is obtained.
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